I am working on pseudocapacitive and battery type material for supercapacitor application. I want calculate electrochemical surface area from cyclic voltammetry curve.
Dear friend Chandradip Jadhav
To calculate the electrochemical surface area (ECSA) from a cyclic voltammetry (CV) curve, you can use the following equation:
ECSA = Q / (2 × n × F × ΔE × A)
where:
- Q is the charge (in Coulombs) associated with the Faradaic process,
- n is the number of electrons involved in the Faradaic process,
- F is the Faraday constant (96485 C/mol),
- ΔE is the potential window (in V) over which the CV curve was measured,
- A is the electrode surface area (in cm²).
To obtain the charge associated with the Faradaic process, integrate the CV curve within the potential window of interest. The integral of the cathodic peak corresponds to the reduction charge and the integral of the anodic peak corresponds to the oxidation charge. The charge associated with the Faradaic process can be obtained by taking the difference between the reduction and oxidation charges.
Once you have obtained the charge associated with the Faradaic process, you can use the above equation to calculate the ECSA. It's important to note that this equation assumes that the electrode is a flat surface, and does not take into account the effects of surface roughness or porosity. Therefore, the calculated ECSA may be an underestimate of the actual surface area.
It's also important to ensure that the CV curve was obtained under conditions of reversible electron transfer, meaning that the peak separation should be less than 59 mV/n (where n is the number of electrons involved in the Faradaic process). If the peak separation is greater than 59 mV/n, the electron transfer is considered to be irreversible, and the ECSA cannot be accurately calculated using CV.
https://www.researchgate.net/post/How_to_calculate_electrochemical_active_surface_area_from_cyclic_voltametry
Thank you for your help Javier Ernesto Vilaso Cadre Kaushik Shandilya
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